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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33c6ee3dbc2d6b6eff02cfc3e8858753adbe401c5b1cd68f14d3e00225d1f1c' 
  AND token = 'G3FHJMKU3zi98UBPGcNoeq8GPugf4h6+uC1T3C6fDTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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