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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b13ed4683569206763fe171a0c95bc15862c3533e8dedf3ebc3a920da805ef' 
  AND token = 'M1XshbFoKIGKRgL1SX79hwv0eBjSI0ciDj+tFsAyw5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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