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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7226f522e48064c371fa989ff06a0a9c8924f51a93fc6e3ff3bf62bcbcba00' 
  AND token = 'm1pkPfPJg/tJ2WaNzlIfRaao7kcRyT/nb+CpEcAfA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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