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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daadc9c43f369d594518d9676a5945f3eda522872b5c4387d3ebcc454fb6137b' 
  AND token = 'jGcrNtxHI2Cuc5sFr1IoroYoCSRTd/VV8e1nMHOtDEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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