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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd77355fd836e53c0f867bc59917dba4ade8a97f6147db81aa6a905b43a6b33c' 
  AND token = '7rh1syjB1Vcwu9GWG5ha4Lp8VbaYEAZL1ez2qQUD6bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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