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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515661cb8e2e2fd7c55cd893caa99d378cf0bb0e92c6293b827195c449632c19' 
  AND token = '4MhVoOFFIB4vseH0SvEHzuGcXpdawad2Z/JfweKeAzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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