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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e9ad6951c24cc4a74e0da760a29a0a46c22d4e569077ffbcec2e7d09bf659b' 
  AND token = '7hA4BGfUBIogukGsbNwAARuqo4glnC/c9ai+w6NrL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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