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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07297eb425b5c2b4743a929174bc5ee5c78b92a0c3d4edc56b955bd239e6836' 
  AND token = 'U93y4X0kHCyifozyNfzJ5t1izTLwIc/S32JeomenueM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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