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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5093f807b43c1ed074cbc30021b0d3b0273578a3968475c5ee7bf6739585febd' 
  AND token = 'YoyhqiDjhYfEmaJeCLd62HDaC+ULNNH3z8ZnxMOAx0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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