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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c6d1f95a410a73ec2d002ada8e64da8c1ae0d633ac96e3ab3a8845e3c53dd4' 
  AND token = 'KUbqVHVUy7fbxMsWrPBxFQlDQz9PSCg/hD7f6ea98AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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