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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba88eb2b2bdc1e3ec37a6992210689a3868861d71856d27c6dff86d8d7874e6' 
  AND token = '4Gn67Tygk46JHRJTN4me8xxfqH0uNmPE0S4oxgeH+jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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