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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebd7f21a641183cf5d09ba03a6649e6ed8607048e97c04771bc206c44f2e986' 
  AND token = 'pik85NLVfNLNLqH6rSuEAK/6W4ATSsvlXZSpHPSnaP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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