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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693e3c6e9506efffb9ecbcd3627d0357fcaf45fd8a9a47c011b77643c805c92e' 
  AND token = 'FBmJfV19z3KBOwz0HDnlPs26otuck4mT8Dvbyj8UU2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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