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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3b11ef5a006a56fa6ecde3fba429a74bf531207cd1a11fbeaa5688190096ca' 
  AND token = 'WJ0hvKNlvejjNBt1Qqd7p1f0keTnz2RIuhDe/b6FHX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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