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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1dacb133a5b9768451af1c9edbe3fda3204574e4ebae07e617b70bd37ca0fc' 
  AND token = 'RlztTcCJLbEhI/TqAT6IHIZ/6LK7tHg1wSz17DfCKiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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