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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfea1c4ff423882fd32a2269cda30abe8b200ec7692f87e3a30fa1082d987d2' 
  AND token = 'XrIRyzYhwKdQugp/KKfFRhDgaRYvw9WVew/A9uv+Rc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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