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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5bc5b9ceea0e713e5d5e22a651cfa248f707ba370572f500d2e98e57c027a1' 
  AND token = 'nyaCWS61pNY/BccMvJA9bN+TCiiGwlJJdvWkvwRvgrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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