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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab2991d9c4be6234b0bb34e2f78baf456a6441173a6c9b9c834da46d63e8653' 
  AND token = 'M7OCP6YxjSCsukQ6i2mZ1gBPBMfTM+ddFr4bW2oqmK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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