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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0112029c3b9a5318e543c0a2dadfd2782cfe9ca8385f7b3781e95bd2c6c332a' 
  AND token = '3AvPFefqCNQNUEM7NT42fir8lVbPHaGQLyr51dRbdwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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