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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e723bd687472d8bc4dd5a86f8b7de7584634e4462cd0e38e0467cd4df7079a7' 
  AND token = '9uSAI84sxQlX2Y85TovIMEodPDCCVRgyCaOZJKYlU1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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