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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7052da5b84a935015503b26cadf55f37ecf1ae171695dc7762b49dedcb4bd2' 
  AND token = 'cHykZ0XSFIEp/k+sDk6i+4YOAZGcK7UmlmaWzvSGVLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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