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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a96695958a80f8cdbb0cfb91aef50677efd9e0009b65bb2b814993087414666' 
  AND token = 'b7Tmond8GCFcA+HA+wRe/6RPlzsz/pPf5f8f8Nv2Nxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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