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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7d00dcc85c98bba034ac34343b1272ea436ec0a5c1c73bb751f6fdd14f1e07' 
  AND token = '/WAmWdOt5KDmIQqG02LqkI1syhfi3Cna4+2m4hLQH5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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