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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a772a1b2d058bcb5c3f8fd0a3fe84adcb90474fc45727f6dd47398abdd4276cf' 
  AND token = 'b00F6aqJLAwYa+yNYy440jWzjQv37gQdWFTNPXHtfLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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