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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b8d272f179a3de232c9f9dd9e91f32d90aeddbe67580a27b5f3a52d3eb0a3c' 
  AND token = 'pvMs8VfKfqsNDNRdaETCy08cbzmmgz9VoK/i9GXr3SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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