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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4e6f4ce69b705bac9faf5f34838dd1d4adb3b248c98ac040d164a04824b61e' 
  AND token = 'nsj/VbbvUClS4sltnR8XcWx4BfINChEszWFv7xIIDvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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