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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dab2843689b82030e51a954de13c75441766cadc5c56e087c324e38e6ad957a' 
  AND token = 'fml6BYFBdk8XZ7fu4CziYoNeCx4FUuou7G+NLxE1PBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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