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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295c12894ac5ad9e5fbf418413633606cb02129245ed98d26e363a3969e4fef7' 
  AND token = 'JSfS0NC3YjJQ754Pdm4UxtY9Upa1bsjeuzFPYG5kavg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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