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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ca3862cae8fd2d481c8fa766f914ffe4693be88fe9029ad0a5f5d582c18b23' 
  AND token = '+5RCndZ8tuYvySsTL2xgtK0jLB4oxr5matspGT3Isqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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