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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935e1684f71a0b59aea864234bddcb160d57f0e970920c2c087d025a2d6d407c' 
  AND token = '3TlzcINa32bpgLp6d1b9fN2j4ZSpNW6s4iPeCfQsV7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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