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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01c34dc37cd56eb3c4d282f94956e4d703cfe455b881039c84f6471909d011d' 
  AND token = '5Ov3N7mtxO26es7zoRNry0UynwbY6Q4H0sVTzybF48A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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