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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e636e2ccce62b32a489e278132f8cb626853dd453a501fdada51042182441b' 
  AND token = 'fNQwLgKw4s+BxOu6QDUWmdvdsJ7Iq1MtSuyTmW01OHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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