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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fddef16f6ec3724d472d7f3dfd47410ff73135e21c363cfd00e347a502db77' 
  AND token = 'S20+OM3ETtPe9IvvUNKbPpBpwndq8KpLAdaW3Iki47M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}