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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9271405e8caa9c23cd0c3a7240c746adfad3138f4e64dfed92d1abe8aa73854f' 
  AND token = '3dzYKRQxhralIBauhF1+ftYZjgzfOBhAETF+Mty6o0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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