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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ec64f7d01c7c71b753dd842c9ade3e906fe9c38da3d43c89974e8a8f91d163' 
  AND token = 'FGWoLf+nq8IIvn/rk5AJKK3PJaUPxoFFIDQECpY6rSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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