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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9db86a964cce11104fcc99842f79c93e95301d382fef96f26cbe6ed90dabf3' 
  AND token = 'g2vF/dgd89RXtWnuTlPA8SXVJ23VhKlHf2o2ThF87F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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