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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef06b29f62a2700111b312e970ddd64d3ef383bccb8765335303a73de7fa7713' 
  AND token = 'KelI5D2luukZfJ1J2G7+Lnze7zYZaXtYCI2Wls6mdQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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