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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99985e6a697c0454a2d2097b2c848a6532a1b3dc356533ace20ef4e566da10e9' 
  AND token = 'pAW3ElRAWhXrSUYn3qLZeUziGb1ICseQknZGP2ktwp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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