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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce79bd7ebcec631df38e52035bcd2959d93425e75caa35df7472a4a51155dd9' 
  AND token = 'G28ObSow6mfRq5/uREnatFNmNMyXlC3P/bH50R7avpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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