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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10690ce2070269b091e69a07887a32dbd92e92ec00e29b7629f780ab82e3f53' 
  AND token = 'eIHMjwFXahx3EokUhcrj5s1Jp5ksZp8U+ARXTP9P+2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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