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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037f11b1d0fc0c221321d4fed27ab371305ff66bbc04b76e83acbb5443f34a6e' 
  AND token = 'mtG5E83Mv+dMyUBfl7LHNLgDvCOHPFwSgM05Xw0FZ+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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