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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30570fdadbc8de30760d8a6b071a16dfeaca82414b30f88b1b5bbedf09b2974' 
  AND token = 'U3s+k0Hkc9P1IP32ZW/5ZzbOnBMZB8LxPjDl/Dicmn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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