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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6fc00e652dc19c23bdad7b800ea246ebd5f32e414e72a13db2fbf1de90b5a3' 
  AND token = 'NTnpgCv02bRhuFV2I8o5zM8YTE/lH23/KW8oJm+dG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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