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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c531920472869e8cb11bb00b60113c7a0753d1d26d939c7b268fc83c9f396ddc' 
  AND token = '/FSzxqQtR5qcEN1VMntYi5MoFRSsllvB6LCGK0mk9CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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