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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9941dfa1f5ab120f0a80ceadae97851b3916d0706c702b51867c6872015cd6' 
  AND token = 'vuBi9RZa/V5v4p2VA83tocegEqSuxeLEDEYATy9wsEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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